<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <form action="login" method="post">
    用户名: <input type="text" name="username"> <br/>
    密码: <input type="password" name="password"> <br/>
    <input type="submit" value="登录">
  </form>
</body>
</html>